Bridgetek FT801 - ALPHA_FUNC

FT800 Series Programmer Guide
Version 2.1
Document Reference No.: BRT_000030 Clearance No.: BRT#037
85
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4.4 ALPHA_FUNC
Specify the alpha test function
Encoding
31 24
23 11
10 8
7
6
5
4
3
2
1
0
0x09
Reserved
func
ref
Parameters
func
Specifies the test function, one of NEVER, LESS, LEQUAL, GREATER, GEQUAL,
EQUAL, NOTEQUAL, or ALWAYS. The initial value is ALWAYS (7)
NAME VALUE
NEVER 0
LESS 1
LEQUAL 2
GREATER 3
GEQUAL 4
EQUAL 5
NOTEQUAL 6
ALWAYS 7
Figure 8: The constants of ALPHA_FUNC
ref
Specifies the reference value for the alpha test. The initial value is 0
Graphics context
The values of func and ref are part of the graphics context, as described in section
4.1
See also
None